The powers of 10 are easy to remember, because we use a base 10 number system.

For 10 n with n a positive integer, just write a " 1 " with n zeros after it. For negative powers 10 − n , write " 0 ." followed by n − 1 zeros, and then a 1 .

The powers of 10 are widely used in scientific notation , so it"s a good idea to get comfortable with them.

 10 1 = 10 10 1 = 1 10 2 = 100 10 -1 = 0.1 10 3 = 1000 10 -2 = 0.01 10 4 = 10,000 10 -3 = 0.001 10 5 = 100,000 (one hundred thousand) 10 -4 = 0.0001 (one ten thousandth) 10 6 = 1,000,000 (one million) 10 -5 = 0.00001 (one hundred thousandth) 10 7 = 10,000,000 (ten million) 10 -6 = 0.000001 (one millionth) 10 8 = 100,000,000 (one hundred million) 10 -7 = 0.0000001 (one ten millionth) 10 9 = 1,000,000,000 (one billion) 10 -8 = 0.00000001 (one hundred millionth) 10 10 = 10,000,000,000 (ten billion) 10 -9 = 0.000000001 (one billionth)

Click here for more names for really big and really small numbers .

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